Coal

To comply with the New Hampshire law governing mercury emissions, Merrimack Station management recently installed a single scrubber system on the facility’s two coal-fired boilers. The plant’s Clean Air Project was completed on Mar. 30, 2012, ahead of schedule and under budget. Now the 440-MW Merrimack Station has reduced its mercury and sulfur dioxide emissions by more than 95% and is one of the cleanest coal-fired power plants in the nation

Low natural gas prices and still-soft electricity demand are forcing low-load and cycling operations at traditionally baseloaded coal units across the country. The resulting challenges were top of mind at the Electric Utility Cost Group’s (EUCG’s) fall meeting in Denver last week. One member of the EUCG’s fossil generation committee from an Ohio Valley utility said that cycling and low-load operations pose challenges for one of his company’s 1,300-MW coal-fired plants that “two years ago we wouldn’t have considered possible.”

In its last legislative act before the November election, the U.S. House of Representatives on Friday passed by a vote of 233 to 175 the controversial "Stop the War on Coal Act," a legislative package of measures that seeks to bar the Environmental Protection Agency (EPA) from promulgating carbon emission rules, calls for an analysis of the cumulative economic impacts of certain environmental rules, and would create a state-based program to regulate coal ash.

In a landmark ruling that has been seen as a major victory for thermal generators, the U.S. Court of Appeals for the District of Columbia Circuit vacated the Environmental Protection Agency’s (EPA’s) Cross-State Air Pollution Rule (CSAPR) in August, finding that it violated federal law. The EPA must now continue implementation of the Clean Air Interstate Rule (CAIR) until it can promulgate a replacement, which likely will not happen until at least 2014.

Dominion Virginia Power plans to convert its oldest coal-fired power plant, the 227-MW Bremo Power Station near Bremo Bluff, Va., to natural gas, the company announced earlier this month. The two-unit plant would be the ninth in its fleet to be closed or converted to alternative fuels.

Injection of carbon dioxide has begun at one of the world’s first fully integrated coal-fired carbon capture, transportation, and geologic storage projects.

The world’s first supercritical pulverized coal–fired low mass flux vertical tube Benson boiler is Jinzhushan 3, located in the Hunan Province of the People’s Republic of China. The 600-MW Babcock & Wilcox Power Generation Group Inc. once-through boiler burns Chinese anthracite using downshot pulverized coal (PC) technology. Part 1 of this three-part article provides a project summary and overview. The other two parts will look at technology features of the unique boiler design and plant performance test results.

After years of development, design, and construction, your plant is finally nearly ready for startup. But don’t light that cigar yet—at least not until you’ve developed a strategy for commissioning your water cycle chemistry. Root causes of corrosion can be predicted and avoided. The best way to avoid corrosion is to develop and implement plant-specific cycle chemistry commissioning guidelines.

Because Powder River Basin (PRB) coal is smaller, more friable, and contains more fine particulates than bituminous coal, controlling the fugitive dust generated as PRB coal moves from bunker to burner tip is problematic. The challenge for material-handling systems at power plants that have switched coals is to minimize this dust and capture it cost-effectively and without compromising safety.

PPL Montana plans to mothball its 154-MW coal-fired J.E. Corette power plant in Billings, Mont., starting in April 2015. The company cited "effects of pending Environmental Protection Agency [EPA] regulations combined with economic factors," as reasons for its decision.

Progress Energy last week shuttered its 382-MW coal-fired H.F. Lee power plant near Goldsboro, N.C. The 1951-built station is the second to be retired under the Duke Energy subsidiary’s fleet modernization program.

RWE npower, the German energy company’s UK arm, on Tuesday said it would shutter its coal-fired 2,000-MW Didcot A Power Station in Oxfordshire and the 1,000-MW oil-fired Fawley Power Station in Hampshire at the end of March 2013 under the European Union’s (EU’s) Large Combustion Plant Directive (LCPD).

Congress has returned from its summer break. As the House prepares to vote on its Upton-Stearns "No More Solyndras Act," lawmakers also expect to focus on a bill that could prohibit finalization of any Environmental Protection Agency (EPA) power plant rules that curb greenhouse gas emissions while carbon capture and storage technology is commercially unavailable. House Democrats, meanwhile, called for hearings to examine the impacts of climate change on the nation’s generators.

The widespread transition from coal to natural gas for new generation is exemplified by the morphing fleets of some of the biggest U.S. generators. Figures show the amount of power generated by each company using coal (top) and natural gas (bottom). Sources: POWER, NextEra, Duke Energy, Tennessee Valley Authority (TVA), Southern Co., American Electric Power […]

Poland, a country that currently depends on coal power for nearly 85% of its electricity and plans to build another 11,300 MW of new coal-fired capacity by 2020, suffered a critical planning setback in mid-July as the European Union (EU) effectively blocked the country from using free carbon emission permits to build new coal-fired power plants.

Several major power plants around the world began operations over the past months.

Droughts, unreliable gas imports, and protests against proposed projects have hampered the Chilean power sector and its largest economic driver, the copper-mining industry. Recent policies designed to foster more reliable supplies are a move in the right direction, but remaining obstacles are formidable.

A federal district court on Thursday ruled in favor of more than 800 plaintiffs when it held the Tennessee Valley Authority (TVA) liable for the December 2008 failure of coal ash containment dikes at its Kingston Fossil plant in Roane County, Tenn., that resulted in the spill of more than a billion gallons of coal ash sludge.

Injection of carbon dioxide began last week at one of the world’s first fully integrated coal-fired carbon capture, transportation, and geologic storage projects. The "Anthropogenic Test" conducted by the Southeast Regional Carbon Sequestration Partnership (SECARB) transports carbon dioxide via a 12-mile pipeline from a 25-MW post-combustion carbon capture facility at Southern Co.’s 2,657-MW Plant Barry in Bucks, Ala., and sequesters it within a saline Paluxy Formation at the nearby Citronelle Oil Field operated by Denbury Resources.

A fire sparked by a conveyor belt at a coal-fired power plant in India’s southern state of Tamil Nadu has killed four workers and seriously injured four others, news media reported on Tuesday.

A three-judge panel of the U.S. Court of Appeals for the D.C. Circuit on June 26 unanimously rejected all pending legal challenges against the U.S. Environmental Protection Agency’s (EPA’s) interpretation of the Clean Air Act (CAA) that allows the agency to regulate greenhouse gases (GHGs). What is the EPA’s future strategy in its war on coal?

—Sonal Patel is POWER’s senior writer.

AES Gener recently completed construction of twin coal-fired, 260-MW units in the electricity-starved desert of northern Chile that may serve as models for future hybrid-fossil plant designs. For meeting an aggressive construction schedule, integrating a 20-MW battery energy storage system, embracing desalination, using the first-of-its-kind seawater cooling tower in South America, and employing innovative financing methods, the AES Gener Angamos plant has earned POWER’s 2012 Plant of the Year Award.

Moving thousands of tons of coal per hour at high speeds through a complex handling system is a main cause of airborne coal dust in a coal-fired plant. Depending upon the coal’s characteristics, that dust can become explosive when its concentration reaches 80 g/m3 and, hence, a threat to life and property. The best option is to stop the dust from becoming airborne in the first place.

New U.S. Environmental Protection Agency regulations affecting the nation’s coal power plants are routinely in the national news. The latest proposed rule focuses on the release of carbon dioxide into the atmosphere. With a substantial amount of coal generation expected to be shut down (up to 40 GW to 50 GW in the coming years by some accounts), the new regulations are increasing the likelihood that this lost capacity will not be replaced by new coal generation.

Wisconsin Power and Light (WPL) Co. plans to retire three of its oldest and smallest coal-fired generating units and invest $1.4 billion into the company’s generating fleet over the next five years to ensure it will be able to manage "current and emerging environmental regulations," the Alliant Energy Corp. subsidiary announced on Friday.

A lawsuit filed in federal court on Friday by Pennsylvania’s Department of Environment Protection (PDEP) alleges that FirstEnergy’s Little Blue Run Dam coal ash impoundment pond in Beaver County, a facility that stores coal ash from the generator’s 2,470-MW Bruce Mansfield coal-fired power plant in Shippingport, Pa., has leached heavy metals in drinking water supplies and surface water. A proposed consent decree could force the generator to shut down the impoundment facility.

The Department of Energy (DOE) on Thursday announced it would award $7 million to eight projects to advance the development of transformational oxy-combustion technologies capable of high-efficiency, low-cost carbon dioxide capture from coal-fired power plants. Leveraged with recipient cost-sharing to support about $9.4 million in total projects, the awards are expected to support the development and deployment of “carbon capture, utilization, and storage (CCUS)” by focusing on further improving the efficiency and reducing the costs associated with carbon capture.

Announcements about coal plant retirements have become commonplace. Are new EPA rules completely to blame, or are there other power market pressures at play?

Advanced ultrasupercritical (A-USC) is a term used to designate a coal-fired power plant design with the inlet steam temperature to the turbine at 700C to 760C. In the first two parts of this three-part report, we introduced the A-USC boiler and the metallurgical advancements required for the A-USC boiler to operate at such high temperatures. This final report explores the A-USC boiler’s unique design challenges.